12187906 has 8 divisors (see below), whose sum is σ = 18727884. Its totient is φ = 5945280.

The previous prime is 12187871. The next prime is 12187943. The reversal of 12187906 is 60978121.

It is a happy number.

12187906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10830681 + 1357225 = 3291^2 + 1165^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74235 + ... + 74398.

Almost surely, 2^12187906 is an apocalyptic number.

12187906 is a deficient number, since it is larger than the sum of its proper divisors (6539978).

12187906 is a wasteful number, since it uses less digits than its factorization.

12187906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148676.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 12187906 is about 3491.1181589857. The cubic root of 12187906 is about 230.1316574510.

The spelling of 12187906 in words is "twelve million, one hundred eighty-seven thousand, nine hundred six".